Differences between PREMIER combustion in a natural gas spark-ignition engine and knocking with pressure oscillations

被引:25
|
作者
Kawahara, Nobuyuki [1 ]
Kim, Yungjin [1 ]
Wadahama, Hisashi [1 ]
Tsuboi, Kazuya [1 ]
Tomita, Eiji [1 ]
机构
[1] Okayama Univ, Dept Mech & Syst Engn, Kita Ku, Tsushima Naka 3, Okayama 7008530, Japan
关键词
Natural gas engine; End-gas auto-ignition; PREMIER combustion; Flame visualization; Pressure oscillation; COMBINED HEAT; ENERGY; PERFORMANCE; GENERATION; IMPACT; MODES;
D O I
10.1016/j.proci.2018.08.055
中图分类号
O414.1 [热力学];
学科分类号
摘要
PREMIER (PREmixed Mixture Ignition in the End-gas Region) combustion occurs with auto-ignition in the end-gas region when the main combustion flame propagation is nearly finished. Auto-ignition is triggered by the increases in pressure and temperature induced by the main combustion flame. Similarly to engine knocking, heat is released in two stages when engines undergo this type of combustion. This pattern of heat release does not occur during normal combustion. However, engine knocking induces pressure oscillations that cause fatal damage to engines, whereas PREMIER combustion does not. The purpose of this study was to elucidate PREMIER combustion in natural gas spark-ignition engines, and differentiate the causes of knocking and PREMIER combustion. We applied combustion visualization and in-cylinder pressure analysis using a compression-expansion machine (CEM) to investigate the auto-ignition characteristics in the end-gas region of a natural gas spark-ignition engine. We occasionally observed knocking accompanied by pressure oscillations under the spark timings and initial gas conditions used to generate PREMIER combustion. No pressure oscillations were observed during normal and PREMIER combustion. Auto-ignition in the end-gas region was found to induce a secondary increase in pressure before the combustion flame reached the cylinder wall, during both knocking and PREMIER combustion. The auto-ignited flame area spread faster during knocking than during PREMIER combustion. This caused a sudden pressure difference and imbalance between the flame propagation region and the end-gas region, followed by a pressure oscillation. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
引用
收藏
页码:4983 / 4991
页数:9
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